The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1992
Filed:
Aug. 16, 1990
Charles E Alexon, Amery, WI (US);
Matthew T Scholz, Woodbury, MN (US);
Robert P Zaspel, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A battery including a vent tower extending inwardly into the battery cell and terminating at a free end. A passageway is provided through the vent tower to allow the venting of gas. The vent tower includes a porous, hydrophobic filter in the passageway adjacent the free end of the vent tower, and a pressure-relief valve in the passage. The free end of the vent tower is spaced sufficiently from any wall of the battery casing that any void defined by a horizontal plane along the free end of the vent tower and the walls of the casing below the horizontal plane is greater than the volume of free electrolyte regardless of the orientation of the battery.